Tools & Wizards About Us
astronomyonline.org screenshot

Report Summary

  • 56

    Performance

    Renders faster than
    72% of other websites

  • 63

    Accessibility

    Visual factors better than
    that of 28% of websites

  • 58

    Best Practices

    More advanced features
    available than in
    20% of websites

  • 90

    SEO

    Google-friendlier than
    68% of websites

astronomyonline.org

Astronomy Online

Page Load Speed

2.3 sec in total

First Response

210 ms

Resources Loaded

646 ms

Page Rendered

1.4 sec

astronomyonline.org screenshot

About Website

Welcome to astronomyonline.org homepage info - get ready to check Astronomy Online best content for United States right away, or after learning these important things about astronomyonline.org

Astronomy Information and Resources

Visit astronomyonline.org

Key Findings

We analyzed Astronomyonline.org page load time and found that the first response time was 210 ms and then it took 2.1 sec to load all DOM resources and completely render a web page. This is quite a good result, as only 40% of websites can load faster.

Performance Metrics

astronomyonline.org performance score

56

Measured Metrics

name

value

score

weighting

FCP (First Contentful Paint)

Value1.1 s

99/100

10%

LCP (Largest Contentful Paint)

Value2.0 s

97/100

25%

SI (Speed Index)

Value1.5 s

100/100

10%

TBT (Total Blocking Time)

Value950 ms

29/100

30%

CLS (Cumulative Layout Shift)

Value0.543

13/100

15%

TTI (Time to Interactive)

Value12.1 s

16/100

10%

Network Requests Diagram

astronomyonline.org

210 ms

css-index.css

46 ms

logo_AstronomyOnline4.jpg

118 ms

counter.js

26 ms

pixel.gif

93 ms

Our browser made a total of 46 requests to load all elements on the main page. We found that 63% of them (29 requests) were addressed to the original Astronomyonline.org, 7% (3 requests) were made to S23.sitemeter.com and 4% (2 requests) were made to Apod.nasa.gov. The less responsive or slowest element that took the longest time to load (339 ms) relates to the external source Apod.nasa.gov.

Page Optimization Overview & Recommendations

Page size can be reduced by 101.5 kB (2%)

Content Size

4.6 MB

After Optimization

4.5 MB

  • HTML
  • Images
  • JavaScript
  • CSS

In fact, the total size of Astronomyonline.org main page is 4.6 MB. This result falls beyond the top 1M of websites and identifies a large and not optimized web page that may take ages to load. 20% of websites need less resources to load. Images take 4.6 MB which makes up the majority of the site volume.

HTML Optimization

-78%

Potential reduce by 34.8 kB

  • Original 44.8 kB
  • After minification 31.1 kB
  • After compression 10.0 kB

HTML content can be minified and compressed by a website’s server. The most efficient way is to compress content using GZIP which reduces data amount travelling through the network between server and browser. This page needs HTML code to be minified as it can gain 13.6 kB, which is 30% of the original size. It is highly recommended that content of this web page should be compressed using GZIP, as it can save up to 34.8 kB or 78% of the original size.

Image Optimization

-1%

Potential reduce by 57.4 kB

  • Original 4.6 MB
  • After minification 4.5 MB

Image size optimization can help to speed up a website loading time. The chart above shows the difference between the size before and after optimization. Astronomy Online images are well optimized though.

JavaScript Optimization

-72%

Potential reduce by 6.6 kB

  • Original 9.3 kB
  • After minification 7.4 kB
  • After compression 2.6 kB

It’s better to minify JavaScript in order to improve website performance. The diagram shows the current total size of all JavaScript files against the prospective JavaScript size after its minification and compression. It is highly recommended that all JavaScript files should be compressed and minified as it can save up to 6.6 kB or 72% of the original size.

CSS Optimization

-83%

Potential reduce by 2.6 kB

  • Original 3.2 kB
  • After minification 2.3 kB
  • After compression 522 B

CSS files minification is very important to reduce a web page rendering time. The faster CSS files can load, the earlier a page can be rendered. Astronomyonline.org needs all CSS files to be minified and compressed as it can save up to 2.6 kB or 83% of the original size.

Requests Breakdown

Number of requests can be reduced by 16 (37%)

Requests Now

43

After Optimization

27

  • AJAX
  • Images
  • JavaScript
  • CSS

The browser has sent 43 CSS, Javascripts, AJAX and image requests in order to completely render the main page of Astronomy Online. We recommend that multiple CSS and JavaScript files should be merged into one by each type, as it can help reduce assets requests and as a result speed up the page load time.

Network Requests Diagram

astronomyonline.org

astronomyonline.org

210 ms

css-index.css

css-index.css

46 ms

logo_AstronomyOnline4.jpg

logo_AstronomyOnline4.jpg

118 ms

counter.js

counter.js

26 ms

pixel.gif

pixel.gif

93 ms

get.gif

get.gif

244 ms

160x30_thumb_black.gif

160x30_thumb_black.gif

153 ms

hs-2016-04-a-small_web.jpg

hs-2016-04-a-small_web.jpg

107 ms

NGC2403HaLRGBColesHelm2048.jpg

NGC2403HaLRGBColesHelm2048.jpg

263 ms

b_Home_on.gif

b_Home_on.gif

56 ms

b_Observation_off.gif

b_Observation_off.gif

58 ms

b_Science_off.gif

b_Science_off.gif

55 ms

b_SolarSystem_off.gif

b_SolarSystem_off.gif

57 ms

b_Stars_off.gif

b_Stars_off.gif

56 ms

b_OurGalaxy_off.gif

b_OurGalaxy_off.gif

82 ms

b_Cosmology_off.gif

b_Cosmology_off.gif

86 ms

b_Astrobiology_off.gif

b_Astrobiology_off.gif

84 ms

b_Exoplanets_off.gif

b_Exoplanets_off.gif

85 ms

b_Astrophotography_off.gif

b_Astrophotography_off.gif

85 ms

spacerDarkBlue.gif

spacerDarkBlue.gif

87 ms

TopLeft.gif

TopLeft.gif

122 ms

TopMiddle.gif

TopMiddle.gif

118 ms

TopRight.gif

TopRight.gif

120 ms

MiddleLeft.gif

MiddleLeft.gif

117 ms

american-flag.jpg

american-flag.jpg

141 ms

IranianFlag.png

IranianFlag.png

124 ms

DonateBtn.gif

DonateBtn.gif

178 ms

Whitehat.jpg

Whitehat.jpg

211 ms

MiddleRight.gif

MiddleRight.gif

144 ms

Hydra.gif

Hydra.gif

165 ms

IrisMainPage.jpg

IrisMainPage.jpg

206 ms

BottomLeft.gif

BottomLeft.gif

208 ms

BottomMiddle.gif

BottomMiddle.gif

205 ms

BottomRight.gif

BottomRight.gif

206 ms

2006WebbySharp.gif

2006WebbySharp.gif

208 ms

m82_hubble_3000.jpg

m82_hubble_3000.jpg

339 ms

counter.asp

counter.asp

15 ms

88x31.png

88x31.png

33 ms

analytics.js

analytics.js

186 ms

mpp.vindicosuite.com

mpp.vindicosuite.com

28 ms

meter.asp

meter.asp

10 ms

meter.asp

meter.asp

16 ms

0

0

63 ms

32 ms

blank.gif

blank.gif

59 ms

0

0

12 ms

Accessibility Review

astronomyonline.org accessibility score

63

Accessibility Issues

Contrast

These are opportunities to improve the legibility of your content.

Impact

Issue

High

Background and foreground colors do not have a sufficient contrast ratio.

Internationalization and localization

These are opportunities to improve the interpretation of your content by users in different locales.

Impact

Issue

High

<html> element does not have a [lang] attribute

Names and labels

These are opportunities to improve the semantics of the controls in your application. This may enhance the experience for users of assistive technology, like a screen reader.

Impact

Issue

High

Image elements do not have [alt] attributes

High

Links do not have a discernible name

Best Practices

astronomyonline.org best practices score

58

Areas of Improvement

Trust and Safety

Impact

Issue

High

Does not use HTTPS

Low

Ensure CSP is effective against XSS attacks

User Experience

Impact

Issue

High

Displays images with incorrect aspect ratio

High

Serves images with low resolution

General

Impact

Issue

High

Browser errors were logged to the console

SEO Factors

astronomyonline.org SEO score

90

Search Engine Optimization Advices

Content Best Practices

Format your HTML in a way that enables crawlers to better understand your app’s content.

Impact

Issue

High

Image elements do not have [alt] attributes

Mobile Friendly

Make sure your pages are mobile friendly so users don’t have to pinch or zoom in order to read the content pages. [Learn more](https://developers.google.com/search/mobile-sites/).

Impact

Issue

High

Document uses legible font sizes

High

Tap targets are not sized appropriately

Language and Encoding

  • Language Detected

    EN

  • Language Claimed

    EN

  • Encoding

    WINDOWS-1252

Language claimed in HTML meta tag should match the language actually used on the web page. Otherwise Astronomyonline.org can be misinterpreted by Google and other search engines. Our service has detected that English is used on the page, and it matches the claimed language. Our system also found out that Astronomyonline.org main page’s claimed encoding is windows-1252. Changing it to UTF-8 can be a good choice, as this format is commonly used for encoding all over the web and thus their visitors won’t have any troubles with symbol transcription or reading.

Social Sharing Optimization

astronomyonline.org

Open Graph description is not detected on the main page of Astronomy Online. Lack of Open Graph description can be counter-productive for their social media presence, as such a description allows converting a website homepage (or other pages) into good-looking, rich and well-structured posts, when it is being shared on Facebook and other social media. For example, adding the following code snippet into HTML <head> tag will help to represent this web page correctly in social networks: